194 MIMOSACEAE. 



1. ACUAN Medic, Prairie Mimosa. 



I. Acuan illinoensis (Michx.) Kuntze. (Desmanthus brachylobus Benth.) 

 In rich bottom lands from Ind. and S. D. to Fla., Tex. and Colo. — Sterling. 



2. MORONGIA Britton. Sensitive-brier. 



i. Moiongia uncinata (Willd.) Britton. {Schrankia uncinata Willd.) On 

 prairies from 111. and S. D. to Fla. and Tex. — Exact locality not given. 



Family 70. CASSIACEAE Link. Senna Family. 



Leaves simply pinnate ; corolla very irregular ; one of the lateral petals (standard) 

 and the lowest petal larger than the rest. i. Chamaeceista. 



Leaves twice pinnate ; corolla regularly zygomorph, the upper petal only differing 

 materially from the rest. 2. Hoffmanseggia. 



I. CHAMAECRISTA Moench. 



1. Chamaecrista fasciculata (Michx.) Greene. {Cassia fasciculata Michx.; 

 C. Chamaecrista Walt. ; not L.) In prairies from Me. and S. D. to Fla., Tex. 

 and Colo. — Denver. 



2. HOFFMANSEGGIA Cav. 



Leaves, flowers and pods with black glandular dots ; pods short, 2-2.S cm. long, 



straight on the back or nearly so. 1. H. Jamesii. 



Dark glandular dots none ; pods 3-4 cm. long, strongly arcuate. 



2. H. drepanocarpa. 



i. Hoffmanseggia Jamesii Torr. In dry soil from Colo, to Tex. and Ariz. 

 ^Alt. 4000-7000 ft. — Rocky Ford; Colorado City; Arkansas River; Wray. 



2. Hoffmanseggia drepanocarpa A. Gray. In dry soil from Colo to Tex. 

 and Ariz. — Caiion City. 



Family 71. FABACEAE Reichenb. Pea Family. 



Filaments distinct. 



Leaves pinnate. Tribe I. Sophoeeae. 



Leaves digitately 3-foliate. Tribe IL Podalyrieae. 



Filaments monadelphous or diadelphous. 



Rachis of the leaves not produced into a tendril or bristle-like appendage, repre- 

 senting the terminal leaflet. 

 Fruit 2-valved or indehiscent, not a loment. 

 Foliage not glandular-dotted. 



Anthers of 2 kinds ; filaments monadelphous ; leaves digitate ; calyx 2- 



lipped. Tribe IIL Genisteae. 



Anthers all alike ; filaments diadelphous ; calyx 5-toothed. 



Leaflets toothed. Tribe IV. Trifolieae. 



Leaflets not toothed. 



Leaves irregularly pinnate ; leaflets even in number, 4 or 6 ; stip- 

 ules gland-like ; flowers umbellate. Tribe V. Loteae. 

 Leaves odd-pinnate ; stipules not gland-like ; flowers racemose or 

 capitate. Tribe VI. Galegeae. 



Foliage glandular-dotted. 



Pod prickly. Tribe VII. Glycyrrhizeae. 



Pod not prickly, indehiscent. Tribe VIII. Psoealeae. 



